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Helium atom has an atomic mass of 4u and...

Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have?

Text Solution

Verified by Experts

Atomic mass due to protons `=2xx1=2u`
Neutrons have almost same mass as protons.
Mass of neutrons `=4-2=2u`
`therefore" Number of neutrons "=2`
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